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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdc9e8c11ba472798f8ccba8509e1cd3188bb0b2e94c994d76e785c0b3f50cc' 
  AND token = 'f/2xzgh7qbJUVpSxV9YLxGS8D6P4I3tE6HETOrS87I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}